Feeding is not completed within the specified time after
starting feeding. (The scan head locking switch is locked)
Underneath the left side of the scanner is a locking mechanism for the scanner. Turn it in the opposite direction and see if that works.
If that doesn't do the trick, there is binding on the ribbon cable underneath the scanner. This can be fixed by removing the slack from it and taping the ribbon cable down with scotch tape. make sure there is enough slack in the cable to move the scanner from one end of the glass to the other.

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A red FLASHING light means there is a minor problem with the unit.
According to the manual there are two options at this point; 1. read the error on the display and solve that problem or 2. The toner is almost empty and needs to be replaced. (you can see which toner is low according to the toner status symbols on the display and just try taking that cartridge out and GENTLY shifting it from side to side a little.) You can tell which toner cartridge it is becasue there will be an arrow in the display above it. Hope this helps.

Your PC has detect low toner in your printer that led it show error flashing.
Normally It can cause by 2 things :
1. You have a low toner ( need to replace toner)
2. You have a clogged up toner ( need to clean /service the printer)

You could try going into the sp modes and check sp 5052-1 this is for independent toner check if the toner cartridge was checked by the copier as empty and you refilled it the machines check of the chip still senses it empty by turning this off it could reset it for you .. I have had some mixed results sometimes it works only occasional failure.. Hope it helps Good Luck A

If you have the user manual look on page 3-1 for Control Panel. The different patterns of on/off/blinking lights indicate what the problem is. If the toner is flashing and status is green, your toner is low and should be replaced....

(blinking every 5 seconds)
Toner Low
Indicates that the toner cartridge is nearly empty. Purchase a new toner and have it ready for when Toner Empty is indicated.
(solid)
Toner Empty
Replace the toner cartridge with a new one.
User's Manual is available at the following location:
http://www.brother-usa.com/Data/Documentation/Printer/User/UM_HL1440_1450_1470N.pdf
Hope this helps.